Gable topped container and paperboard blank

ABSTRACT

A gable topped container and a paperboard blank for forming the containers constructed with ridge panels that are a substantially common width and with an end closure member having an interrupted, weakened line of severance at an elevation higher than the lowermost edges of the ridge panels with the uppermost edges of the roof panels and end closure member being at a substantially common elevation. The weakened line of severance is coated with a material being of a type for preventing sealing of the ridge panels to the portion of the end closure member covered by said material coating.

Elified tates atent MacEwen 1 Mar. 27, 1973 541 GABLE TOPlED CONTAINERAND 3,297,227 l/l967 Wallstem ..229 17 0 PAPERBOARD BLANK 3,450,3286/l969 Barrett ....229 17 G 3,471,076 10/1969 Crawford... ....229/l7 GInventorl George MflcEwen, Kansas CIIY, 3,543,993 12 1970 Rausing.........229 17 G M I 3,543,993 12 1970 Rausing 229 17 3 A Ph'lli [7 1sslgnee g gz Company Bartles Primary ExaminerDavis T. Moorhead f VAttorney-Young and Quigg [22] Filed: Jan. 25, 1971 211 Appl. No.:109,177 [57] ABSTRACT A gable topped container and a paperboard blankfor Related Application Dam forming the containers constructedwith ridgepanels [63] Cmtinuafiomimpan of 51 495 July 1 that are a substantiallycommon width and with an end 1970 closure member having an interrupted,weakened line of severance at an elevation higher than the lowermost 52U.S. c1. ..229/17 G edges the PamelS with the edges [51 1111.0. .3651!5/72 the Panels end cksure member being a [58] Field 0 Search /17 G 7substantially common elevation. The weakened line of I severance iscoated with a material being of a type for preventing sealing of theridge panels to the portion of [56] Relerenc Cited the end closuremember covered by said material UNITED STATES PATENTS coating- 3,178,09l4/1965 Tobias et al. ..229 17 0 13"Claim3, (iii-swing Figures 3,245,6034/1966 Wilcox ..229/17 G PATEr-Hfnamznsm' 3,722,780

SHEET 10F 4 'INVENTOR.

G. E. Mac E WE N BY H D YR A T TORNEYS PATENTEUHARZYIQYS 3 722,7 0

SHEET 3 BF 4 INVENTOR. G. E. Moo EWEN A 7' TORNEYS PATENTEDHARZYISYS3.722780 SHEET u 0F 4 INVENTOR. G.E. MacEWEN ATTORNEYS GABLE TOPPEDCONTAINER AND PAPERBOARD BLANK This application is acontinuation-in-part of copending US. application Ser. No. 51,495, filedJuly 1, 1970.

It is desired to have a gable topped container having ridge panels andan end closure member each having an upper edge at a common elevationwith a pour spout within one of said elements located at an elevationhigher than the lowermost edges of the ridge panels.

This invention therefore resides in a gable topped container and apaperboard blank for forming the container, which container has ridgepanels and an end closure member each having an upper edge at a commonelevation with an interrupted, ,weakened line of severance extendingtraversely within the end closure member at a elevation higher than thelowermost edges of the ridge panels.

Other aspects, objects and advantages of the present invention willbecome apparent from a study of the disclosure, the appended claims, andthe drawing. i

In the drawing,

FIG. 1 is a perspective view of a container embodying the invention,

FIG. 2 is a plan view of one embodiment of the paperboard blank fromwhich the container of this invention is formed,

FIG. 3 is a perspective view of the gable topped structure in partialcross section in a partially opened condition,

FIG. 4 is a perspective view of the gable topped structure in partialcross section in an advanced open condition,

FIG. 5 is a perspective view of the gable topped structure in the fullyopened condition, and- FIG. 6 is a partial view of another, preferredembodiment of the paperboard blank of this invention.

Referring to FIG. 2, the rectangular blank is provided with verticalscore lines 12, 13, 14 and 15, extending upwardly from the lower edge ofthe blank to a series 1-6 of first horizontally extending score lines16a, 16b, 16c, 16d and 16e. The score lines 13, 14 and 16b define afront sidewall panel 17. Score lines 15 and 16d, and 12 and l6e definepanels 18 and 19, the free edges of which in the formed container areoverlapped and joined by a permanent adhesive bond to form a rearsidewall panel which is located opposite front side panel 17. First 22and second 21 end wall panels are defined by score lines 14, 15, and16c. and 12, 13, and 160, respectively. With this scoring arrangement asshown in FIG. 2, the panels 17, 21, 22, and the rear wall panel formedby panels 18 and 19 are all of equal width in the formed condition ofthe container.

The vertical score lines 12, l3, l4, and 15, which are located at thevertical corners of the completed container as shown in FIG. I, extendupwardly past score line 16, as at 23, 24, 25, and 26, and terminate atthe top edge of the blank. A second horizontal score line 27 is locateda short distance downward from the upper edge of the blank and parallelto the upper edge of the blank. When the blank has been folded intubular form and overlapping edges of the panels 18 and 19 have beenjoined together, a bottom closure 20 (FIG. 1) is permanently sealed tothe lower ends of the tubular formation. Score lines 24, 25, 16b and 27define the front roof closure panel 28. Score lines 24, 25, and 27define a ridge panel 29, surmounting the front roof closure panel 28.Score lines 23, 26, 16d, and 162, and 27 define the rear roof closurepanel comprised of sections 31 and 32. .Score lines 26, 23, and 27define the ridge panel, comprising sections 33 and 34, surmounting therear roof panel. Scorelines 25, 26, 16c, and 27 define the firstrectangular end closure panel. This first end closure panel is providedwith converging score lines 44 and 45, which at their upper endsintersect score line 27 medial of score lines and 26, thus defining afirst triangular end closure panel portion 46 and a pair of firstfold-back panels 47 and 48. Score lines 23, 24, 16a and 27 define asecond rectangular end closure panel. This end closure panel is providedwith converging score lines 35 and 36, which at their upper endintersect the second score line 27 medial of score lines 23 and 24, thusdefining a second triangular end closure panel portion 37 and a pair ofsecond triangular foldback panel portions 38 and 39. Score lines 23, 2427 and 41 define ridge panels 42 and 43, surmounting second fold-backpanel portions 38 and 39, respectively. Score lines 25, 26 and 27 defineridge panel 51 surmounting the first fold-back panels 47 and 48. In thecompleted container, the pair of opposed roof panels 28 and 31, 32, areinclined toward each other and overlie the top of the tubular bodyformed by sidewalls 17, 21, 22 and 18, 19. The pair of second opposedtriangular end closure panels '37 and 46 are enfolded between roofpanels 28 and 31, 32, from the opposite gable ends formed by the latter,and with their apexes located at the central area of the gable.

The fold lines 44, 45, and 35, 36 which join each pair of first andsecond triangular fold-back panels 47, 48 and 38, 39 to opposite sidesof the first and second tri angular end closure panels 46 and 37 are inproximity with the roof panels, the'fold-back panels being foldedagainst the underside of the roof panels. Ridge panel 51 surmounting thefirst fold-back panels 47 and 48 is hinged together at the apex of thefirst end closure panel 46 and is folded as shown in FIG. 1 about thehinge joinder score line 49 in face-to-face relation, between the ridgepanels 29 and 33 surmounting the roof panels. Similarly, ridge panels 42and 43 surmounting fold-back panels 38 and 39 are hinged together at theapex of the second end closure panel 37 and are folded about the hingedjoinder score line 41 in face-to-face relation, between ridge panels 29and 34. The ridge panels 29, 33, 34, 42,43 are of a common width, andcommon elevation and are sealed to one another.

FIG. 6 shows another embodiment of the blank of this invention forforming the container of this invention. In this preferred embodiment, aportion of the second score line 27 is interrupted between verticalscore lines 14 and 15 thereby forming second score line portions 27' and27" on the blank and an end closure member 54 defined by an upper edge56 of the blank and score lines 25, 44,- 45, and 26.

Referring to FIG. 2, at least one of the ridge panels, 51 for example,of its associated fold-back panels 47,

48 has an interrupted weakened line of severance 60 extending solelywithin and along its ridge panels. A

portion 52 of the ridge panel 51 about and immediately adjacent the lineof severance 60 is not sealed to another ridge panel. This unsealedportion 52 of the ridge panel 51 preferably extends at least to the edgeof the ridge panel below the line of severance 60 over the length of theweakened line of severance 60 for assuring easily breaking and openingof the pour spout formed by this line of severance 60 and adjacentstructure. More preferably, the coating material extends at least 5/16inch below the line of severance over the length of the weakened line ofseverance.

In the embodiment shown in FIG. 3, the interrupted, weakened line ofseverance 60 extends traversely across an upper portion of the endclosure member 54 t an elevation higher than the lowermost edges of theridge panels defined by score lines 27, 27". The upper edge of said endclosure member is at a common elevation with the upper edges of theridge panels 29, 33, 34,

- 42, 43 thereby forming a blank having a linear upper edge 56 as theblank of FIG. 2.

The other aspects of the blank shown in FIG. 6 and the container formedtherefrom are as described with reference to the blank of FIG. 2. Theomission of the portion of score line 27 provides increased snap-opencharacteristics as hereafter described and further prevents damage tothe coating material applied to portion 52 during scoring of the blank,for example.

The coating material, for example, one selected from the groupcomprising heat resistant latex water varnish type, catalyzed epoxytype, fluoro-carbon type, and various nitrocellulose type materialformulated from a base nitrocellulose resin and a modifying resin, forexample, is coated on an inner side of the unsealed portion 52 of thecarton to prevent adherence of that portion 52 to other portions of thecarton.

The weakened line of severance 60 comprises a straight line cut thatextends completely through the ridge panel 51 with said out line beinginterrupted by at least two spaced-apart uncut portions 80 and 81. Theseuncut portions preferably each have a length at least as great as thethickness of the container blank in order to assure that said line ofseverance 60 does not sever prematurely during forming of the container.The uncut portions are preferably not greater than three times thethickness of the container blank or the container. A length of from I to2 times the container thickness is preferred. In order to preventleakage of material through this severance line 60, it is preferred thatthe severance line 60 terminate at locations spaced from the side edgesof the ridge panel 51 or the end closure member 54 upon which the lineof severance 60 is formed. The ridge panels of FIG. 2 and the ridgepanels and a portion of the end closure member of FIG. 6 preferably havea polyethylene coating for heat sealing of the panels one to the other.

In order to provide a snap-action for opening and closing the pouringspout, the front roof panel 28 is provided with score line 71 extendingupwardly from the intersection of the horizontal score line 16b andvertical score line 25 to a point on score line 27 midway betweenvertical score lines 24 and 25. The rear roof panel portion 31 is alsoprovided with score line 74 corresponding to score line 71.

The container, FIG. 1, formed from the blank of either FIG. 2 or FIG. 6,can be opened by applying outward pressure against the fold-back panels47 and 48 to cause a separation of the bond between the adjacent outerfaces of ridge panel 51. The container at this stage is illustrated inFIG. 3. Roof panels 28 and 31, 32

have broken along score lines 71 and 74, respectively. Pressure can thenbe applied against the end closure member 54 or panels 47, 51, and 48,52 as applicable to move these panels toward the container as shown inFIG. 4. Further pressure can then be applied to sever triangular endclosure panels 47 and 48 or end closure member 54 along the weakenedline of severance 60 from ridge panels 29 and 33 and cause triangularpanels 46, 47 and 48 or panel 46 and end closure member 54 to snappartially open. FIG. 5 illustrates a container in the stable openedposition. The container can be closed by applying a pressure againstpanel 46 to move it inwardly at a point during such inward movement,panel 46 will experience a snap-action and be returned to its stableclosed position, similar to position illustrated in FIG. 3.

Other modifications and alterations of this invention will becomeapparent to those skilled in the art from the foregoing discussion andaccompanying drawings, and it should be understood that this inventionis not to be unduly limited thereto.

What is claimed is:

1. In a gable topped container of sheet material comprising a tubularbody having four sidewalls, a bottom closure, a pair of opposed roofpanels inclining toward each other and overlaying the top of said body,first and second triangular end closure panels being enfolded betweensaid roof panels from the opposite gable ends formed by the latter, apair of triangular fold-back panels each joined to opposed sides of thesecond triangular end closure panel along fold lines which are inproximity with said roof panels, said fold-back panels being foldedagainst the underside of said roof panels, a separate ridge panelsurmounting each of said roof panels and said second pair of triangularfold-back panels, each pair of ridge panels surmounting the second pairof triangular fold-back panels being hinged together at the apex of thecontiguous end closure panel and being folded about such hinged joinderin face-to-face relationship between the ridge panels surmounting saidroof panels, the first triangular end closure panel having an endclosure member joined to the roof panels, the ridge panels of the roofpanels, and to opposed sides of the first triangular end closure panelalong fold lines which are in proximity with said roof panels, said endclosure member being folded against the underside of said roof panels inface-to-face relationship with the ridge panels surmounting said roofpanels, the improvement comprising:

the end closure member. having an interrupted, weakened line ofseverance extending traversely across an upper portion of said endclosure member at an elevation higher than the lowermost edges of theridge panels with an upper edge of said end closure member being at acommon elevation with the uppermost edges of the ridge panels and beingsealed to the adjacent ridge panels of theroof panels, and a coatingmaterial covering the end closure member at a location about andimmediately adjacent the line of severance, said coating material beingof a type for preventing sealing of the ridge panels to the portion ofthe end closure member covered by said material coating, said coatingmaterial extending at least 5/16 inch below the line of severance overthe length of the weakened line of severance.

2. A gable topped container, as set forth in claim 1, wherein the ridgepanels and end closure member have a polyethylene coating and are heatsealed one to the other.

3. A gable topped container, as set forth in claim 1, wherein theweakened line of severance comprises a straight cut line extendingcompletely through the end closure member with said cut line beinginterrupted by at least two spaced-apart uncut portions.

4. A gable topped container, as set forth in claim 3, wherein theinterrupted portions of the cut line each have a length of not greaterthan about three times the thickness of the container blank.

5. A gable topped container, as set forth in claim 1, wherein theinterrupted, weakened line of severance terminates at locations spacedfrom the side edges of the end closure member upon which the line ofseverance is formed.

6. A gable topped container, as set forth in claim 1, wherein a scoreline extends traversely across the end closure member defining a ridgepanel thereon that is of substantially equal width relative to the ridgepanels of the associated roof panels for dividing the end closure memberinto a ridge panel and a pair of triangular fold-back panels.

7. In a paperboard blank for forming a container of rectangularformation having a gable top, said blank being formed with laterallyspaced-apart score lines extending vertically from the lower to theupper edge of the blank, a first score line extending traversely of theblank in downward-spaced relationship to the upper edge thereof, saidfirst score line in conjunction with said vertically extending score'line, defining opposed front and rear sidewall panels and opposed firstand second end wall panels, a second interrupted traversely extendingscore line arranged at a common elevation intermediate the upper edge ofsaid blank and said first traversely extending score line and defining,in conjunction therewith and with said vertically extending score lines,a first roof closure panel surmounting said front sidewall panel, a rearroof. closure panel surmounting said rear sidewall panel, and an areasurmounting said second end wall panel, said area being provided withconverging score lines inclining upwardly from said first traverse scoreline to its respective second traverse score line defining a triangularend closure panel and a second pair of triangular fold-back panelshinged to the triangular end closure panel, converging score linesinclining upwardly from said first traverse score line adjacent thefirst end wall panel to the elevation of the second score line anddefining a first triangular end closure panel and an end closure member,the improvement comprising:

ridge panels having a common width surmounting 5 said roof panels andbeing defined by the second traversely extending score line beingparallel to the upper edge of the blank and in conjunction with saidvertically extending score lines;

a second end wall panel defined by the first score line in conjunctionwith said vertically extending score lines;

.an interrupted, weakened line of severance extending traversely acrossan upper portion of said end closure member at an elevation higher thanthe second score line; and

a coating material covering the end closure member at a location aboutand immediately adjacent the line of severance, said coating materialbeing of a type for preventing sealing of the ridge panels to theportion of the end closure member covered by said material coating, saidcoating material extending at least 5/16 inch below the line ofseverance over the length of the weakened line of severance.

8. A paperboard blank, as set forth in claim 7, wherein the ridge panelsand the end closure member have a polyethylene coating and are heatscalable one to the other.

9. A paperboard blank, as set forth in claim 7, wherein the materialabout and immediately adjacent the line of severance extendsat least toan elevation of the second score line over the length of said weakenedline of severance.

10. A paperboard blank, as set forth in claim 7, wherein the weakenedline of severance comprises a straight out line extending completelythrough the paper board with said cut line being interrupted by at leasttwo spaced-apart uncut portions.

11. A paperboard blank, as set forth in claim 10, wherein theinterrupted portions of the second cut line have a length not greaterthan about three times the thickness of the paperboard blank.

12. A paperboard blank, as set forth in claim 7, wherein theinterrupted, weakened line of severance terminates at locations spacedfrom the adjacent ridge panels.

13. A paperboard blank, as set forth in claim 7, wherein the secondscore line is continuous, traverses the entire blank and thereby dividesthe end closure member into a pair of fold-back panels and a ridgepanel.

UNITED STATES PATHJT OFFICE CERTIFICATE OF CORRECTION Patent Noe3,722,780 Dated= March 27, 1973 George E. MacEwen It is certified thaterror appears in the above-identified patent and that sari LettersPatent are hereby corrected as shown below:

Column L line 56, after being at" insert substantially Column line 3A,after "score" the word line should read lines ---5 line 37, after at a"insert substantially Column 6, line 4, after "panels" insert eaclafter-"having" insert substantially line 5, after and insert said area,said end closure member and said ridge panels having upper edges at asubstantiallg comnwn elevation, said ridge panels line 6, after "being"insert substantial line 8, delete line 9, delete "a second end wallpanel insert and said enc closure member being Signed and sealed this18th day of December 1973.

(SEAL) Attest:

EDWARD M. FLETCHER, JR. RENE D. TscTMsmR v Attesting Officer 1 ActingCommissioner of Patents

1. In a gable topped container of sheet material comprising a tubularbody having four sidewalls, a bottom closure, a pair of opposed roofpanels inclining toward each other and overlaying the top of said body,first and second triangular end closure panels being enfolded betweensaid roof panels from the opposite gable ends formed by the latter, apair of triangular fold-back panels each joined to opposed sides of thesecond triangular end closure panel along fold lines which are inproximity with said roof panels, said fold-back panels being foldedagainst the underside of said roof panels, a separate ridge panelsurmounting each of said roof panels and said second pair of triangularfoldback panels, each pair of ridge panels surmounting the second pairof triangular fold-back panels being hinged together at the apex of thecontiguous end closure panel and being folded about such hinged joinderin face-to-face relationship between the ridge panels surmounting saidroof panels, the first triangular end closure panel having an endclosure member joined to the roof panels, the ridge panels of the roofpanels, and to opposed sides of the first triangular end closure panelalong fold lines which are in proximity with said roof panels, said endclosure member being folded against the underside of said roof panels infaceto-face relationship with the ridge panels surmounting said roofpanels, the improvement comprising: the end closure member having aninterrupted, weakened line of severance extending traversely across anupper portion of said end closure member at an elevation higher than thelowermost edges of the ridge panels with an upper edge of said endclosure member being at a common elevation with the uppermost edges ofthe ridge panels and being sealed to the adjacent ridge panels of theroof panels, and a coating material covering the end closure member at alocation about and immediately adjacent the line of severance, saidcoating material being of a type for preventing sealing of the ridgepanels to the portion of the end closure member covered by said materialcoating, said coating material extending at least 5/16 inch below theline of severance over the length of the weakened line of severance. 2.A gable topped container, as set forth in claim 1, wherein the ridgepanels and end closure member have a polyethylene coating and are heatsealed one to the other.
 3. A gable topped container, as set forth inclaim 1, wherein the weakened line of severance comprises a straight cutline extending completely through the end closure member with said cutline being interrupted by at least two spaced-apart uncut portions.
 4. Agable topped container, as set forth in claim 3, wherein the interruptedportions of the cut line each have a length of not greater than aboutthree times the thickness of the container blank.
 5. A gable toppedcontainer, as set forth in claim 1, wherein the interrupted, weakenedline of severance terminates at locations spaced from the side edges ofthe end closure member upon which the line of severance is formed.
 6. Agable topped container, as set forth in claim 1, wherein a score lineextends traversely across the end closure member defining a ridge panelthereon that is of substantially equal width relative to the ridgepanels of the associated roof panels for dividing the end closure memberinto a ridge panel and a pair of triangular fold-back panels.
 7. In apaperboard blank for forming a contAiner of rectangular formation havinga gable top, said blank being formed with laterally spaced-apart scorelines extending vertically from the lower to the upper edge of theblank, a first score line extending traversely of the blank indownward-spaced relationship to the upper edge thereof, said first scoreline in conjunction with said vertically extending score line, definingopposed front and rear sidewall panels and opposed first and second endwall panels, a second interrupted traversely extending score linearranged at a common elevation intermediate the upper edge of said blankand said first traversely extending score line and defining, inconjunction therewith and with said vertically extending score lines, afirst roof closure panel surmounting said front sidewall panel, a rearroof closure panel surmounting said rear sidewall panel, and an areasurmounting said second end wall panel, said area being provided withconverging score lines inclining upwardly from said first traverse scoreline to its respective second traverse score line defining a triangularend closure panel and a second pair of triangular fold-back panelshinged to the triangular end closure panel, converging score linesinclining upwardly from said first traverse score line adjacent thefirst end wall panel to the elevation of the second score line anddefining a first triangular end closure panel and an end closure member,the improvement comprising: ridge panels having a common widthsurmounting said roof panels and being defined by the second traverselyextending score line being parallel to the upper edge of the blank andin conjunction with said vertically extending score lines; a second endwall panel defined by the first score line in conjunction with saidvertically extending score lines; an interrupted, weakened line ofseverance extending traversely across an upper portion of said endclosure member at an elevation higher than the second score line; and acoating material covering the end closure member at a location about andimmediately adjacent the line of severance, said coating material beingof a type for preventing sealing of the ridge panels to the portion ofthe end closure member covered by said material coating, said coatingmaterial extending at least 5/16 inch below the line of severance overthe length of the weakened line of severance.
 8. A paperboard blank, asset forth in claim 7, wherein the ridge panels and the end closuremember have a polyethylene coating and are heat sealable one to theother.
 9. A paperboard blank, as set forth in claim 7, wherein thematerial about and immediately adjacent the line of severance extends atleast to an elevation of the second score line over the length of saidweakened line of severance.
 10. A paperboard blank, as set forth inclaim 7, wherein the weakened line of severance comprises a straight cutline extending completely through the paper board with said cut linebeing interrupted by at least two spaced-apart uncut portions.
 11. Apaperboard blank, as set forth in claim 10, wherein the interruptedportions of the second cut line have a length not greater than aboutthree times the thickness of the paperboard blank.
 12. A paperboardblank, as set forth in claim 7, wherein the interrupted, weakened lineof severance terminates at locations spaced from the adjacent ridgepanels.
 13. A paperboard blank, as set forth in claim 7, wherein thesecond score line is continuous, traverses the entire blank and therebydivides the end closure member into a pair of fold-back panels and aridge panel.
 14. In a gable topped container of sheet materialcomprising a tubular body having four sidewalls, a bottom closure, apair of opposed roof panels inclining toward each other and overlayingthe top of said body, first and second triangular end closure panelsbeing enfolded between said roof panels from the opposite gable endsformed by the latter, a pair of triangular fold-back panels each joinedto opposed sideS of the second triangular end closure panel along foldlines which are in proximity with said roof panels, said fold-backpanels being folded against the underside of said roof panels, aseparate ridge panel surmounting each of said roof panels and saidsecond pair of triangular fold-back panels, each pair of ridge panelssurmounting the second pair of triangular fold-back panels being hingedtogether at the apex of the contiguous end closure panel and beingfolded about such hinged joinder in face-to-face relationship betweenthe ridge panels surmounting said roof panels, the first triangular endclosure panel having an end closure member joined to the roof panels,the ridge panels of the roof panels, and to opposed sides of the firsttriangular end closure panel along fold lines which are in proximitywith said roof panels, said end closure member being folded against theunderside of said roof panels in face-to-face relationship with theridge panels surmounting said roof panels, the improvement comprising:the end closure member having an interrupted, weakened line of severanceextending traversely across an upper portion of said end closure memberat an elevation higher than the lowermost edges of the ridge panels withan upper edge of said end closure member being at substantially a commonelevation with the uppermost edges of the ridge panels and being sealedto the adjacent ridge panels of the roof panels, and a coating materialcovering the end closure member at a location about and immediatelyadjacent the line of severance, said coating material being of a typefor preventing sealing of the ridge panels to the portion of the endclosure member covered by said material coating, said coating materialextending at least 5/16 inch below the line of severance over the lengthof the weakened line of severance.
 15. In a paperboard blank for forminga container of rectangular formation having a gable top, said blankbeing formed with laterally spaced-apart score lines extendingvertically from the lower to the upper edge of the blank, a first scoreline extending traversely of the blank in downward-spaced relationshipto the upper edge thereof, said first score line in conjunction withsaid vertically extending score line, defining opposed front and rearsidewall panels and opposed first and second end wall panels, a secondinterrupted traversely extending score line arranged at a substantiallycommon elevation intermediate the upper edge of said blank and saidfirst traversely extending score line and defining, in conjunctiontherewith and with said vertically extending score lines, a first roofclosure panel surmounting said front sidewall panel, a rear roof closurepanel surmounting said rear sidewall panel, and an area surmounting saidsecond end wall panel, said area being provided with converging scorelines inclining upwardly from said first traverse score line to itsrespective second traverse score line defining a triangular end closurepanel and a second pair of triangular fold-back panels hinged to thetriangular end closure panel, converging score lines inclining upwardlyfrom said first traverse score line adjacent the first end wall panel tothe elevation of the second score line and defining a first triangularend closure panel and an end closure member, the improvement comprising:ridge panels each having substantially a common width surmounting saidroof panels, said second end closure member and said ridge panels havingupper edges at a substantially common elevation, said ridge panels beingdefined by the second traversely extending score line beingsubstantially parallel to the upper edge of the blank and in conjunctionwith said vertically extending score lines and said second end closuremember being defined by the first score line in conjunction with saidvertically extending score lines; an interrupted, weakened line ofseverance extending traversely across an upper portion of said endclosure member at an elevation higher than the second Score line; and acoating material covering the end closure member at a location about andimmediately adjacent the line of severance, said coating material beingof a type for preventing sealing of the ridge panels to the portion ofthe end closure member covered by said material coating, said coatingmaterial extending at least 5/16 inch below the line of severance overthe length of the weakened line of severance.